fxpeek

get_latest_rate

Get the latest available source-linked reference exchange rate for a currency pair (e.g. USD to CNY). Reference data, not a transaction quote.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "from": "<from>",
      "to": "<to>"
    },
    "name": "get_latest_rate"
  }
}

Input Schema

Name	Required	Description	Default
`to`	Yes	ISO 4217 target currency code, e.g. CNY
`from`	Yes	ISO 4217 base currency code, e.g. USD

Schema Changelog

Changes observed during successful MCP inspections.

First observedSep 12, 2026

TDQS

A3.5/5.0

Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries the full burden. It discloses that data is source-linked reference data rather than a transaction quote, which is meaningful context. However, it omits freshness/latency details (how 'latest' is defined), error behavior for unsupported pairs, and whether the response needs further interpretation.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

A single compact sentence front-loads the core action and ends with the key disambiguation ('Reference data, not a transaction quote'). Zero waste.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a simple 2-param read tool this is nearly adequate, but with no annotations and no output schema, the description should say more about what 'latest' means (timestamp/freshness) and how errors are surfaced. It does not.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the schema already documents 'from' and 'to' as ISO 4217 codes with examples. The description adds only the example pair (USD to CNY), which duplicates the schema examples. Baseline 3 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb (get) and resource (latest exchange rate) with scope (reference, not transaction quote) and an example pair. It does not name or contrast with the sibling get_history, which is the natural alternative for historical vs. latest data.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Implies usage via 'latest available' and 'reference data, not a transaction quote,' but never states when to use this tool versus get_history. No explicit when/when-not guidance or alternative routing.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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